#define _CRT_SSSECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a = 0;
	int b = 0;
	scanf("%d", &a);
	if ((a >= 1 && a <= 16) || (a >= -15 && a <= -1))
	{
	 b=12;
	 printf("%d\n", b);
	}
	else
	{
		b = 13;
		printf("%d\n", b);
	}

	return 0;
}